Wenger is spot on about everything there, as usual (I figured I'd throw this in here, just in case the link hadn't gotten Biggus riled up enough already).
But really, it's about time. Wenger reiterates what a lot of people have said during the years. There weren't any good arguments against it ten years ago and there aren't any good arguments against it now. Give it a season or two while they work out the kinks and they'll start to look at offsides and penalty situations too.